Vertical Tank Level Sensor – 5-Hole SAE Flange (Stainless)

This vertical level sensor brings modern reliability and accuracy to your boat’s tank monitoring. Unlike traditional float-on-arm senders, it uses a vertically sliding float along a stainless shaft, triggering a series of internal reed switches. This design eliminates the possibility of the float sticking due to boat motion and provides more precise readings throughout the range. The sensor is suitable for both fuel tanks (gasoline or diesel) and water/holding tanks – its materials are compatible and won’t be affected by different fluids.

Installation: The sender mounts via a standard SAE 5-hole flange (S5 pattern). That means if your tank has a pre-cut opening with five threaded holes in a circle (very common, especially on Western-made tanks), this sender will bolt right up. A gasket and screws are included for a secure, leak-free seal. Choose a probe length that matches your tank’s depth – ideally slightly shorter than the internal height so it doesn’t bottom out. Installation is straightforward: remove the old sender (if present), drop in the new one, and tighten the screws evenly. Then connect the signal wire and ground.

Electrical Compatibility: Versions are available to match different resistance standards. The most popular are the 240 Ω (empty) – 33 Ω (full) models, widely used in the USA and many Asian boats, and the ~10 Ω (empty) – 180 Ω (full) models for European manufacturers (VDO standard). Some variants cover 0–190 Ω range. Verify which standard your gauge requires – the sender must match to read correctly. The good news is, if you’re replacing an old 5-hole sender, this Osculati unit likely has an option that directly corresponds. It works with both 12 V and 24 V systems (the sender itself doesn’t need a power feed – it changes resistance).

Advantages: In addition to its durable materials (stainless steel resists corrosion and wear), the vertical sender is also highly accurate. Because it uses multiple sensing points (a chain of reed switches), the signal to your gauge changes smoothly and linearly. This means a steadier needle on your gauge with less oscillation. The sensor is virtually maintenance-free – there are no exposed pivot mechanisms to wear out or corrode.

• Upgrade for old systems: Ideal for replacing outdated or faulty fuel/water senders – improves reliability of readings and eliminates “jumping” gauge needles
• Safety: Lets you always know exactly how much fuel (or water) you have, preventing unexpected run-outs in open water
• Versatility: The same type of sender can be used for fuel or water tanks – simplifies installation of identical sensors for different onboard tanks
• Osculati quality: Designed by Osculati, a leading Italian marine manufacturer known for high standards – precisely built and tested to ISO/CE norms
• Customization option: For custom projects or tanks with non-standard depth, Osculati offers made-to-order sensor lengths (minimum order may apply)